Simon_m
Guru
I've not been there, but I think that the old military site at Orford is off limits for general access and is limited to pre-booked tours by foot only - you'd need to check this. As far as the roads go, they're mostly OK - narrow single carriageway B or C/unclassified with badly worn surface dressing topping with the main problem being sand covering the damaged edges on the really rural back road bits.
As for the train connections, if you get the Intercity service that leaves Liverpool Street on the hour, this arrives in Ipswich at about 5 past the next hour and the East Suffolk line train for Lowestoft leaves at quarter past giving you 10 minutes which is plenty of time to get your bike over the bridge from platform 3 to platform 1 (there is a lift).
ah ok, the photos look great of the island. Maybe another day. Been looking on streetview while planning the route and yes, lots of sand by edge of road which can be tricky if loose concentration. ok i will take a look at that time table for the trains. thanks very much